Drying box humidity automatic control system

Abstract

The invention discloses an automatic humidity control system for drying boxes. The automatic humidity control system is provided with one or more drying boxes, detection modules, a power module, a control module and a nitrogen supply module, wherein the number of the detection modules is the same as that of the drying boxes; each detection module is installed on the outer side of the corresponding drying box and can detect the opening and closing state of a box door. The power supply module supplies power to each module; the nitrogen supply module supplies or supplements nitrogen to the drying box; the control module is provided with an early starting relay and a time-delay relay, nitrogen can be supplied in advance before the box door is opened, and nitrogen can be supplied in a time-delay mode after the box door is closed. Through automatic detection of the opening and closing state of the box door and application design of the vision and AI technology, the problem that in an existing drying box technology, much moisture enters during door opening is solved, accurate and stable control over nitrogen in the drying box is achieved, and the traditional problem that the material drying quality is affected by door opening is solved.

Description

Technical Field

[0001] This invention relates to humidity control technology for drying ovens, specifically to a device for regulating the humidity of a drying oven using nitrogen gas. Background Technology

[0002] Drying ovens, as moisture-proof and oxidation-proof storage devices, are widely used in fields such as electronic components, chemical raw materials, and precision materials. The stability of their internal humidity directly affects the quality of the stored items.

[0003] Currently, the known humidity control technology for drying ovens mainly controls the required humidity by simply replenishing gas (mainly nitrogen to remove water vapor). The core implementation path includes: 1. Manually controlling the gas replenishment valve and judging whether nitrogen needs to be replenished based on experience. This relies on manual operation and is prone to untimely or excessive replenishment; 2. Nitrogen leakage when the door is opened, allowing external water vapor to easily enter and the humidity to exceed the control range.

[0004] Patent No.: CN205897716U A fully automatic drying system requires a dehydrator + deaerator + heat exchanger, which has a complex structure and high energy consumption; moisture can easily enter when opening and closing the box door to take out or put in materials.

[0005] The facial recognition access control system described in Sogou Encyclopedia is a secure and practical biometric access control system based on advanced facial recognition technology. This system adopts a split design, separating facial information collection and recognition from internal and external access control, resulting in high practicality and reliability. The system uses encrypted network information transmission, supports remote control and management, and can be widely used in access security control in key areas such as banks, military facilities, and smart buildings. This technology can be used as a reference in this invention. Summary of the Invention

[0006] Purpose of the invention: The main challenges of existing drying oven technology are: humidity control is not a full-process process, it relies heavily on manual intervention, and it is difficult to control the pressure and humidity stability of nitrogen in the drying oven when it is opened.

[0007] The purpose of this invention is to achieve an integrated control system for a drying oven through modular design, which detects the opening and closing status of the oven door, automatically replenishes nitrogen when the door is opened or replenishes nitrogen in advance before the door is opened, replenishes nitrogen after the door is closed, or provides humidity status prompts. This ensures that the nitrogen in the drying oven is always sufficient and that opening and closing the door has almost no impact on the humidity inside.

[0008] Technical solution: The automatic humidity control system for the drying oven of the present invention has the following hardware: Several drying ovens, along with the same number of detection modules, a power supply module, a control module, a nitrogen supply module, or a humidity signal indication module. Alternatively, a main solenoid valve may be included, which is either normally open (during normal use of the drying oven, the aforementioned delayed or pre-opening solenoid valve is required for gas replenishment) or normally closed (when the drying oven is not in use for extended periods).

[0009] Place the material to be dried (such as electronic components) in the drying oven.

[0010] Power supply module: supplies power to all other modules and can be equipped with AC220V input and output interfaces.

[0011] Control Module: Connects to and receives signals from the corresponding detection module and controls the start and stop of the nitrogen supply module. The control module is equipped with an advance start relay and a delay relay (delay time adjustable from 0-60 seconds). The front panel of the control module may include a power switch (controlling the power supply module's on / off state), a door opening alarm (alarming the operator when the door is opened), a delay adjuster (adjusting the delay duration of the delay relays), and a delay indicator (displaying the on / off status of the delay relays). The rear panel of the control module connects to an external humidity signal module interface and a nitrogen supply module interface.

[0012] Detection module: A corresponding detection module is installed on the outside of the door of each drying oven to detect the opening and closing status of the drying oven door.

[0013] Nitrogen supply module: Nitrogen is supplied or replenished to the corresponding drying chamber through one or more solenoid valves; the flow rate can be adjustable (flow range 3-15L / min), and the replenishment rate can be preset according to the size of the chamber to avoid the problem of excessive pressure due to excessive replenishment or delayed humidity recovery due to excessively slow replenishment.

[0014] The aforementioned signal indication module is capable of testing and displaying the humidity of the gas in each drying chamber.

[0015] The working logic of this invention is as follows: In standby mode, all doors are closed, the proximity switches of the detection module are disconnected, and the pre-start relay and time delay relay KT are not working, so the equipment is in low-power standby mode.

[0016] In addition, the working logic of the relay is to be activated in advance: Each detection module is equipped with a sensing and discrimination function for operators or corresponding material boxes (for conveying materials to be dried in the drying chamber or for removing dried materials from the drying chamber). When the operator prepares to open the door or the material box approaches the corresponding drying chamber at a certain distance, the relay is activated in advance to close, and the corresponding solenoid valve of the drying chamber opens in advance to increase the supply of nitrogen gas, so that the nitrogen gas pressure in the drying chamber is higher than the atmospheric pressure. When the drying chamber door is opened, the internal nitrogen gas pressure prevents external moisture from entering the drying chamber.

[0017] The aforementioned operator perception and judgment refers to using visual recognition functions (camera and visual recognition software) to identify the operator's face, and using an AI-trained model to identify the operator's preparatory action to open the door (person facing the drying chamber + hand raised and close to the door), determining it as "about to open the door", triggering the corresponding pre-start relay to close, and pre-filling the drying chamber with nitrogen.

[0018] The working logic of a time-delay relay: After the operator closes and resets the door of a drying oven, its proximity switch is disconnected, the time-delay relay coil is energized, and it starts working according to the set delay time. The corresponding time-delay solenoid valve opens or closes accordingly to continue replenishing air into the oven (to compensate for nitrogen loss during door opening and quickly restore the target humidity). When the set time is reached, the time-delay relay is disconnected, the air replenishment work stops, and the equipment returns to standby mode.

[0019] In this invention, the preferred circuit connection relationship is as follows: The AC220V power supply to the power module is input through the XS1 interface, and then connected to the DC24V switching power supply via the power switch S and the FU fuse to convert the AC power to DC24V (DC24V is a safe voltage to avoid electrical operational risks; the fuse provides overcurrent protection to prevent short-circuit damage to the equipment). The XS2 interface is connected in parallel to the AC220V input circuit. An external power connection interface is provided for direct connection to other auxiliary equipment of the drying oven without additional wiring.

[0020] The detection module uses normally closed proximity switches, each installed on the door of each drying oven, to check the open / closed status of the door. One or more proximity switches are connected in parallel. When the door is closed, they are in the open state; when a door is opened, the corresponding normally closed proximity switch is activated, resulting in a direct signal response.

[0021] When the system has both early start relays and time delay relays, the early start solenoid valve and the time delay solenoid valve can be the same, saving the number of parts and reducing hardware costs; or they can be two connected in parallel to prevent cross-interference.

[0022] In this invention, several humidity sensors in the preferred signal prompt module are respectively plugged into each drying chamber. When the humidity in the drying chamber exceeds the preset value, the sensor transmits the signal to the control module. The control module then controls the nitrogen supply module to start and opens the corresponding solenoid valve to assist in replenishing the nitrogen until the humidity in the corresponding drying chamber returns to the set value, at which point the operation stops.

[0023] Beneficial effects: This invention achieves the following core advantages: 1. No manual operation is required; it automatically responds to the door's opening and closing status and simultaneously triggers air replenishment. 2. When the material box is detected to be approaching, nitrogen is automatically added in advance to make the air pressure in the drying chamber greater than atmospheric pressure, effectively preventing moisture from entering when the door is opened (in traditional technology, the delay function of the action is mostly used, and there is no mature technology for advance action). 3. Delayed gas replenishment after door closing quickly compensates for nitrogen loss when the door is opened, ensuring stable humidity.

[0024] Specifically, this is reflected in the following ways: Improved humidity control accuracy: The dual protection of pre-air replenishment upon opening the door and delayed air replenishment shortens the humidity recovery time after closing the door by more than 60% compared to traditional single air replenishment equipment. It can stably control the humidity inside the drying chamber within the target value within ±3%, meeting the requirements for storing precision materials.

[0025] Improved nitrogen utilization: The time-delay relay precisely controls the replenishment time, avoiding nitrogen waste caused by "long-term replenishment" or continuous replenishment of traditional equipment. Based on a 20-second delay for each replenishment, approximately 120L of nitrogen can be saved per day (based on a flow rate of 10L / min).

[0026] Labor costs are significantly reduced: There is basically no need for manual supervision of the door opening and closing status, resulting in a significant reduction in labor costs.

[0027] Highly expandable: The control module has multiple interfaces, allowing for the connection of more drying ovens and testing modules.

[0028] Highly adaptable: It can be widely used in various fields with stringent requirements for humidity control in drying ovens, such as electronics manufacturing, material storage, and laboratories, and is compatible with drying oven equipment of different specifications. Attached Figure Description

[0029] Figure 1 This is an automatic control circuit diagram of the present invention; Figure 2 This is another automatic control circuit diagram of the present invention; Figure 3 This is a three-dimensional structural schematic diagram of the present invention; Figure 4 yes Figure 3 Another perspective illustration; Figure 5 This is a front view of the control module.

[0030] In the diagram, 1-Normally closed proximity switch connector; 2-Humidity sensor connector; 3-Normally closed proximity switch; 6-Time delay relay; 7-Advance solenoid valve; 70-Time delay solenoid valve; 700-Main solenoid valve (can be closed continuously); 10-Advance start relay; 11-Drying oven door; 12-Detection module; 13-Control module; 14-Signal indication module; 15-Pressure display; 16-Pressure control line; 17-Nitrogen pipe; 19-Humidity control line; 20-Power switch; 21-Door opening alarm; 22-Time delay regulator; 23-Advance start indicator; 30-Power cord (connects to power module). Detailed Implementation

[0031] Example 1: There is one drying oven, one detection module, and one time delay relay.

[0032] The automatic humidity control system for the drying oven of this application includes a drying oven, a power supply module, a control module 13, and a nitrogen supply module; the power supply module supplies power to the other modules; the nitrogen supply module provides or replenishes nitrogen to the drying oven through a time delay relay 6 and a time delay solenoid valve 70.

[0033] like Figure 1 The diagram shows the layout of the "Automatic Control Circuit of Drying Oven". In the diagram: XS1 - AC220V input, CON1 - Normally closed proximity switch connector 1, SQ1 is a normally closed proximity switch 3, CON2 - Humidity sensor connector 2, KT - Time delay relay 6, and Time delay solenoid valve 70.

[0034] Another detection module 12 is installed on the outside of the corresponding drying oven door 11; the detection module 12 is used to detect the open or closed state of the drying oven door 11. After receiving the open or closed signal from the detection module 12, the control module 13 controls the opening or closing of the time-delay solenoid valve 70.

[0035] like Figure 5 As shown, the front panel of the control module 13 has a power switch 20 to control the power supply of the module; it may also have a door opening alarm 21 to alert the operator when the door is opened; and a delay regulator 22 to adjust the delay duration of the delay relay 6. External humidity signal module interface and nitrogen supply module interface are connected to the back of the control module 13.

[0036] Actual usage steps: Step 1: Adjust the nitrogen source pressure to 0.4MPa, turn on the device power switch, and input AC220V AC power through the XS1 interface. Power the DC24V switching power supply through the 2A fuse. The switching power supply outputs a stable DC24V voltage. At this time, all the cabinet doors are closed.

[0037] Step 2: When the operator opens the door (such as the door corresponding to SQ1), the normally closed proximity switch SQ1 (3) of the door is turned on, and nitrogen is continuously supplied to the drying chamber through the gas pipe 17.

[0038] Step 3: After the operator closes all the cabinet doors 11, the normally closed proximity switch SQ1 is opened, and the DC24V power supply powers the coil of the time delay relay 6 through this contact (preset delay of 10 seconds). The KT coil is energized and its pins 1 and 4 close. The time delay solenoid valve KT70 is activated after being connected to the power supply, and continues to replenish the air into the cabinet (to compensate for the nitrogen loss during the opening of the doors and quickly restore the humidity to the target value of 45%). When the time delay relay KT6 reaches the preset 10-second delay, its pins 1 and 4 automatically disconnect to stop replenishing the air, the coil of the time delay relay KT6 is de-energized and resets, and the device returns to the standby state.

[0039] Example 2: There are 6 drying ovens, 6 detection modules, 6 advance start relays, and 6 advance start solenoid valves.

[0040] like Figure 3 , 4 The automatic humidity control system for the drying oven shown is used to regulate the humidity inside the drying oven to ensure the quality of stored materials. It has 6 drying ovens, one power module, one control module 13, and one nitrogen supply module. The power module supplies power to the other modules. The nitrogen supply module provides or replenishes nitrogen to its respective drying oven through 6 advance solenoid valves 7, which are the same number as the drying ovens.

[0041] There are also 6 identical detection modules 12 installed on the outside of the corresponding drying oven door 11; the detection modules 12 are used to detect the open or closed state of the corresponding drying oven door 11.

[0042] Adopting such Figure 2 The layout diagram of the "automatic control circuit of drying oven" shows that after the control module 13 receives the signal of opening or closing from the detection module 12, it controls the corresponding advance solenoid valve 7 to open or close.

[0043] The control module 13 has six identical pre-start relays 10. Each detection module 12 is equipped with operator perception and judgment functions or corresponding material box perception and judgment functions. When the detection module 12 detects that the operator is preparing to open the door or the material box is close to the corresponding drying box at a certain distance, the control module 13 controls the corresponding pre-start relay 10 to start, and the pre-start solenoid valve 7 corresponding to the drying box opens to replenish nitrogen, so that the nitrogen pressure in the drying box is higher than the atmospheric pressure.

[0044] like Figure 5 As shown, the control module 13 has a power switch 20 on its front panel to control the power supply of the module; it may also have a door opening alarm BELL 21 to alert the operator that the door has been opened; and an early start indicator 23 to show the on / off status of the early start relay 10.

[0045] When an operator approaches any drying chamber of the system, the system uses visual recognition to identify the operator's face and an AI-trained model to identify the operator's preparation to open the door. If the system determines that the door is about to be opened, it will trigger the corresponding advance start relay 10 to start and pre-fill the drying chamber with nitrogen.

Claims

1. A kind of dry box humidity automatic control system, for regulating and controlling humidity in dry box to guarantee the quality of stored material, with 1-Several dry boxes, a power module, a control module (13), a set of nitrogen supply module;Power module supplies power for other modules;Nitrogen supply module provides or supplies nitrogen in respective corresponding dry box by the same number of solenoid valve (7) as dry box;Characterized in that: There are the same number of detection modules (12) as dry box installed on the outside of the door (11) of corresponding dry box; Said detection module (12) is used to detect the open or closed state of the door (11) of corresponding dry box; After receiving the open or closed signal of the detection module (12), the control module (13) controls the on or off of the corresponding solenoid valve respectively; The control module (13) has the same number of pre-starting relays (10) as dry box, and each detection module (12) is equipped with the sensing discrimination of operator or the sensing discrimination function of corresponding material box, when the detection module (12) detects that the operator presents the action of preparing to open the door or the material box is close to the corresponding dry box at a certain distance, the control module (13) controls the corresponding pre-starting relay (10) to start, and the solenoid valve of the dry box opens to supply nitrogen, so that the nitrogen pressure in the dry box is higher than atmospheric pressure.

2. The system for automatic control of humidity in a drying oven according to claim 1, characterized in that: The sensing discrimination of operator refers to identifying the face of operator by visual recognition function, and identifying the action of preparing to open the door of operator by AI trained model, determining as "about to open the door", triggering the start of corresponding pre-starting relay (10), and pre-supplying nitrogen in the dry box.

3. The system for automatic control of humidity in a drying oven according to claim 1, characterized in that: The control module (13) contains the same number of delay relays (6) as dry box, and each delay relay contact is linked to the solenoid valve of corresponding dry box;After the door (11) of the dry box is closed, the corresponding delay relay (6) starts, continues to supply nitrogen to the dry box for a certain time and then turns off.

4. The system for automatic control of humidity in a drying oven according to claim 3, characterized in that: The delay relay (6) is DC24V digital adjustable type, and the adjustable delay range is 0-60 seconds.

5. The dry box humidity automatic control system of claim 1 or 2, wherein: There is also a set of signal prompting module (14) which can display the humidity in each dry box, and the control module (13) can accept the humidity signal of signal prompting module (14);When the humidity in a certain dry box is high, the corresponding solenoid valve (7) is opened, and the nitrogen supply module starts to supply nitrogen to the dry box;When the humidity is normal or low, stop supplying nitrogen.

6. The dry box humidity automatic control system of claim 1 or 2, wherein: The detection module (12) uses normally closed proximity switch (3), which is in normally closed state when there is no induction, and is in open state when there is induction.

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